<template>
  <div>
    <div id="watch-example">
      <p>
        Ask a yes/no question:
        <el-input v-model="question" style="width: 300px"></el-input>
      </p>
      <p>{{ answer }}</p>

      <br />
      <VuexCar></VuexCar>
    </div>
  </div>
</template>
<script type="text/ecmascript-6">
import VuexCar from '../components/VuexCar';

const axios = require(`axios`);
export default {
    props: [],
    components: {
        VuexCar
    },
    data() {
        return {
            question: ``,
            answer: `I cannot give you an answer until you ask a question!`
        };

    },
    watch: {
        // 如果 `question` 发生改变，这个函数就会运行
        question: function (newQuestion, oldQuestion) {
            this.answer = `Waiting for you to stop typing...`;
            this.debouncedGetAnswer();
        }
    },
    created: function () {
        // `_.debounce` 是一个通过 Lodash 限制操作频率的函数。
        // 在这个例子中，我们希望限制访问 yesno.wtf/api 的频率
        // AJAX 请求直到用户输入完毕才会发出。想要了解更多关于
        // `_.debounce` 函数 (及其近亲 `_.throttle`) 的知识，
        // 请参考：https://lodash.com/docs#debounce
        this.debouncedGetAnswer = _.debounce(this.getAnswer, 500);
    },
    methods: {
        getAnswer: function () {
            if (this.question.indexOf(`?`) === -1) {
                this.answer = `Questions usually contain a question mark. ;-)`;
                return;
            }
            this.answer = `Thinking...`;
            let vm = this;
            axios.get(`https://yesno.wtf/api`)
                .then(function (response) {
                    vm.answer = _.capitalize(response.data.answer);
                })
                .catch(function (error) {
                    vm.answer = `Error! Could not reach the API. ` + error;
                });
        }
    }
};
</script>
